Mueller, 55, testified on Tuesday that he may have made innocent contact with Swift but denied any inappropriate behaviour. Asked if he grabbed her backside, the former disc jockey for Denver radio station KYGO-FM replied, "No, I did not."

Swift, who spent an hour on the witness stand on Thursday, said it appeared both Mueller and his girlfriend, who stood on the other side of her for the photo, had "had a few cocktails."

Asked why her bodyguard did not step in when "this big drunk guy" groped her, Swift replied: "No one could have expected this to happen. ... It had never happened before. It was horrifying and shocking."

Questioned by the attorney as to whether it might simply have been a case of mistaken identity on her part, she fired back: "He had a handful of my ass. I know it was him."

Asked about her reaction when she learned that Mueller had been fired, Swift replied, "I just never wanted to see him again. And here we are years later and I'm being blamed for the unfortunate events in his life," referring to the DJ losing his job.

Mueller sued Swift, claiming she cost him his job and is seeking over £2 million in damages resulting in the musician to file a counter suit, alleging sexual assault.

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The Shake it Off hitmaker, who is asking for a symbolic $1 judgement, says she wants to be an example to other assault victims.

The 27-year-old star, dressed in a floral print dress, testified that she tried to get as far away from Mueller as she could but didn't want to stop the event and disappoint the few dozen people waiting in line.

She said she couldn't have said anything about what happened without others already in the photo area overhearing - testifing that "this was something I did not want known."

The star was questioned by David McFarland, representing Mueller, on why she didn't stop the meet and greet and report Mueller's actions to her security she replied that she didn't want to ruin the experience of her fans who were in line to meet with her "and your client could have taken a normal photo with me."

Taylor said that she doesn't blame her former body guard Greg Dent who witnessed the assault for not stopping Mueller, telling jurors, "I'm not critical of my bodyguard for not doing anything, I'm critical of your client (Mueller) for sticking his hand under my skirt and grabbing my a**."

Swift said she was absolutely stunned and told Mueller and his girlfriend, Shannon Melcher, "thank you for coming" in a monotone voice before they left.

Her lawyers have said she does not know Mueller and has no incentive to target him or to fabricate a story.

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A court sketch of Mueller holding his head in his hand

AP:Associated Press

Superstar Taylor is suing David Mueller for just $1

Mueller is also suing the singer for $3million in damages

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A court sketch shows Taylor Swift attending court with her legal team

Taylor Swift does the Mannequin Challenge on the beach with her squad on a Thanksgiving

The case is being tried in federal court in Denver under a law allowing the proceeding when the parties live in separate states and the dispute involves a damages claim higher than £60,000.